20 Biggest Dinosaurs To Ever Exist

Some people still aren't sure whether these creatures really did roam the earth, but one thing's for sure, if they did, they were some of the biggest animals in the history of the animal kingdom.

20. Cute or heavily scary?

Moschops was the moo-cow of the late Permian period. This slow creature shuffled across the plains of southern Africa 255 million years ago, possibly in sizable herds. It is about sixteen feet long and weighs one ton.

19. A father of many

Archosaurs were presumed to evolve not only into dinosaurs, but into pterosaurs and crocodiles as well. They weighed only 10, 20, or perhaps 50 pounds. They in turn evolved from an earlier group of diapsid reptiles, which means having two openings in the skull behind the eye.

18. Mosasaurs, the swimming gator

This fifteen ton sea creature’s habitat was worldwide. It had a blunt, alligator-like head and had fins on end of its tail. They lived almost sixty five to seventy years ago.

17. The eel-est beast

Plesiosaurs had long necks, slender trunks, and streamlined flippers. It is a predator of small fish and squid, measured about 45 feet from head to tail and weighed a relatively petite two or three tons.

16. The ruthless eater

This creature is known for its manner of consumption; eating everything in its path. It is named Kronosaurus, after the mythical Greek god Cronus, who ate his own children. They are known by their squat torsos, thick heads, short necks, and long flippers.

15. A cross-bred beast.

Ichthyosaurs, the "fish lizards," were large, dolphin-like marine reptiles that dominated the seas of the Triassic and Jurassic periods. For years, the biggest ichthyosaur was believed to be Shonisaurus, until the discovery of a 75 ton Shonisaurus.

14. Beware the sea monsters!

Cretaceous Archelon was about 12 feet long and weighed in at about two tons. The fossil remains of Archelon were hailed from Wyoming and South Dakota, which 75 million years ago were submerged beneath the Western Interior Sea.

13. The scariest serpent

The 50-foot-long, one-ton Titanoboa prowled the humid swamps of early Paleocene South America. Its weight was about the size and weight of an extremely elongated school bus and looked like a boa constrictor, but hunted like a crocodile.

12. A Super Croc

At 40 feet long, Sarcosuchus weighed as much as 15 tons at least twice as long, and ten times as heavy, as the biggest crocodiles alive today. It is known to be found in the African rivers.

11. A large winged beast

When measuring the size of pterosaurs, it's not weight that counts, but wingspan. It was the size of a small airplane, and presumably capable of gliding long distances on its massive wings.

10. A really big boy

The South American Riojasaurus is the largest prosauropod yet identified, at 30-foot-long, 10-ton. It is a herbivore and dates back to the late Triassic period, over 200 million years ago. It has a long neck and tail and slender legs.

9. Big bird, small wings

This is a central Asian "dino-bird". It is a gentler breed of theropod known as an oviraptorosaur. The question of the type of meal this creature relied on is yet to be answered.

8. Less is better?

This dinosaur is said to grown up to the height of a titanosaurus. It has four hinds, but when in pursuit by predators, the Magnapaulia at 25 tons is able to run on only on its two hind legs.

7. Blow the horn!

Titanoceratops, the "titanic horned faced dinosaur was measured as a full-grown creature to be 25 feet from head to tail and weighing north of five tons. The head is said to aid with sexual selection.

6. Hard rock, Mr. T.

Tyrannosaurus Rex, also known as the T- Rex had previously won the crown of the biggest dinosaur in the world. There is evidence that T. Rex females outweighed males by a half ton or so.

5. Talk about a butt that kills

Utahraptor weighed in at 1,500 pounds and was a full 20 feet long. This creature has a huge, curved and clawed rear that it used to slash and gut its prey. It is said to be the ancestor of the well-known Velociraptor.

4. Spotted and sharp

At sixty feet and twenty tons, Camarasaurus is characterized by its large, boxy skull; hollow vertebrae; single claw on front feet. It is portrayed to have spots on its skin and spikes to the top of its neck.

3. A clawed creature

Dreadnoughtus schrani has the largest reliably calculable weight of any known land animal, which was calculated to be sixty five point four tons. It is described to have an appearance of an old creature but its claws work just fine.

2. The crouching giant.

The Amphicoelias, similar in form to titanosaurs was discovered to weigh up to two hundred feet long and one hundred and twenty five tons, but is more likely to be eighty feet long and fifty tons.

1. Head as high as a kite

The argentinosaurus, discovered in 1986 in Argentina, is recognized as the biggest dinosaur in the world. This Titanosaur, recognized by its long neck and tail is measured to be approximately, 120 feet from head to tail and weigh 100 tons.

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